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   "source": [
    "# Copyright 2014 Brett Slatkin, Pearson Education Inc.\n",
    "#\n",
    "# Licensed under the Apache License, Version 2.0 (the \"License\");\n",
    "# you may not use this file except in compliance with the License.\n",
    "# You may obtain a copy of the License at\n",
    "#\n",
    "#     http://www.apache.org/licenses/LICENSE-2.0\n",
    "#\n",
    "# Unless required by applicable law or agreed to in writing, software\n",
    "# distributed under the License is distributed on an \"AS IS\" BASIS,\n",
    "# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n",
    "# See the License for the specific language governing permissions and\n",
    "# limitations under the License.\n",
    "\n",
    "# Preamble to mimick book environment\n",
    "import logging\n",
    "from pprint import pprint\n",
    "from sys import stdout as STDOUT"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# Example 1\n",
    "def to_str(data):\n",
    "    if isinstance(data, str):\n",
    "        return data\n",
    "    elif isinstance(data, bytes):\n",
    "        return data.decode('utf-8')\n",
    "    else:\n",
    "        raise TypeError('Must supply str or bytes, '\n",
    "                        'found: %r' % data)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "# Example 2\n",
    "from unittest import TestCase, main\n",
    "\n",
    "class UtilsTestCase(TestCase):\n",
    "    def test_to_str_bytes(self):\n",
    "        self.assertEqual('hello', to_str(b'hello'))\n",
    "\n",
    "    def test_to_str_str(self):\n",
    "        self.assertEqual('hello', to_str('hello'))\n",
    "\n",
    "    def test_to_str_bad(self):\n",
    "        self.assertRaises(TypeError, to_str, object())\n",
    "        "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# Example 3\n",
    "from tempfile import TemporaryDirectory\n",
    "from unittest import TestCase\n",
    "class MyTest(TestCase):\n",
    "    def setUp(self):\n",
    "        self.test_dir = TemporaryDirectory()\n",
    "    def tearDown(self):\n",
    "        self.test_dir.cleanup()\n",
    "    # Test methods follow"
   ]
  }
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